Nil.
And if we do ,one day,find ourselves governed by what's effectively an anti Europe one trick pony party, god help us!
Don't forget William Hague as leader of the Conservatives won the 1999 Euro election, he beat Tony Blair by campaigning on an anti Euro ticket by 34% to 26% of the vote,but, a fat lot of good it did him come the following General Election, which Blair walked.